/Engine/Source/Runtime/Engine/Classes/PhysicsEngine/BodySetup.h
Finds the closest point in the body setup. Input and outputs are given in world space.
NOTE: This function ignores trimesh data
The distance between WorldPosition and the body setup. 0 indicates WorldPosition is inside one of the shapes.
float GetClosestPointAndNormal ( const FVector & WorldPosition, const FTransform & BodyToWorldTM, FVector & ClosestWorldPosition, FVector & FeatureNormal, bool bUseConvexShapes ) const